We've been deploying office 365 medium business over the past few months and have started using Lync and I've run into an issue at one of my sites with Open DNS. We have the chat and instant messaging categories blocked @ that location and it's preventing lync from contacting the login server, for now I've turned off blocking of those categories, but I'd like to be able to white list the sign in server so I can turn blocking back on.
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